The Knights of Ethbir

Ethbir 
The Well in Ethbir 
Order founded by Saint Kargoth that defeated the evil in Devils valley, and then founded the Holy settlement of Ethbir
The 13 Knights, all champions of their Gods, led a holy crusade and after enormous battles and much sacrafice they expelled the evil...
However their leader turned on them before the end, was tired but then freed by the Demogorgon before they were all cast out by The Gods